1 #include <linux/ceph/ceph_debug.h> 2 3 #include <linux/module.h> 4 #include <linux/fs.h> 5 #include <linux/slab.h> 6 #include <linux/string.h> 7 #include <linux/uaccess.h> 8 #include <linux/kernel.h> 9 #include <linux/namei.h> 10 #include <linux/writeback.h> 11 #include <linux/vmalloc.h> 12 13 #include "super.h" 14 #include "mds_client.h" 15 #include "cache.h" 16 #include <linux/ceph/decode.h> 17 18 /* 19 * Ceph inode operations 20 * 21 * Implement basic inode helpers (get, alloc) and inode ops (getattr, 22 * setattr, etc.), xattr helpers, and helpers for assimilating 23 * metadata returned by the MDS into our cache. 24 * 25 * Also define helpers for doing asynchronous writeback, invalidation, 26 * and truncation for the benefit of those who can't afford to block 27 * (typically because they are in the message handler path). 28 */ 29 30 static const struct inode_operations ceph_symlink_iops; 31 32 static void ceph_invalidate_work(struct work_struct *work); 33 static void ceph_writeback_work(struct work_struct *work); 34 static void ceph_vmtruncate_work(struct work_struct *work); 35 36 /* 37 * find or create an inode, given the ceph ino number 38 */ 39 static int ceph_set_ino_cb(struct inode *inode, void *data) 40 { 41 ceph_inode(inode)->i_vino = *(struct ceph_vino *)data; 42 inode->i_ino = ceph_vino_to_ino(*(struct ceph_vino *)data); 43 return 0; 44 } 45 46 struct inode *ceph_get_inode(struct super_block *sb, struct ceph_vino vino) 47 { 48 struct inode *inode; 49 ino_t t = ceph_vino_to_ino(vino); 50 51 inode = iget5_locked(sb, t, ceph_ino_compare, ceph_set_ino_cb, &vino); 52 if (inode == NULL) 53 return ERR_PTR(-ENOMEM); 54 if (inode->i_state & I_NEW) { 55 dout("get_inode created new inode %p %llx.%llx ino %llx\n", 56 inode, ceph_vinop(inode), (u64)inode->i_ino); 57 unlock_new_inode(inode); 58 } 59 60 dout("get_inode on %lu=%llx.%llx got %p\n", inode->i_ino, vino.ino, 61 vino.snap, inode); 62 return inode; 63 } 64 65 /* 66 * get/constuct snapdir inode for a given directory 67 */ 68 struct inode *ceph_get_snapdir(struct inode *parent) 69 { 70 struct ceph_vino vino = { 71 .ino = ceph_ino(parent), 72 .snap = CEPH_SNAPDIR, 73 }; 74 struct inode *inode = ceph_get_inode(parent->i_sb, vino); 75 struct ceph_inode_info *ci = ceph_inode(inode); 76 77 BUG_ON(!S_ISDIR(parent->i_mode)); 78 if (IS_ERR(inode)) 79 return inode; 80 inode->i_mode = parent->i_mode; 81 inode->i_uid = parent->i_uid; 82 inode->i_gid = parent->i_gid; 83 inode->i_op = &ceph_dir_iops; 84 inode->i_fop = &ceph_dir_fops; 85 ci->i_snap_caps = CEPH_CAP_PIN; /* so we can open */ 86 ci->i_rbytes = 0; 87 return inode; 88 } 89 90 const struct inode_operations ceph_file_iops = { 91 .permission = ceph_permission, 92 .setattr = ceph_setattr, 93 .getattr = ceph_getattr, 94 .setxattr = ceph_setxattr, 95 .getxattr = ceph_getxattr, 96 .listxattr = ceph_listxattr, 97 .removexattr = ceph_removexattr, 98 }; 99 100 101 /* 102 * We use a 'frag tree' to keep track of the MDS's directory fragments 103 * for a given inode (usually there is just a single fragment). We 104 * need to know when a child frag is delegated to a new MDS, or when 105 * it is flagged as replicated, so we can direct our requests 106 * accordingly. 107 */ 108 109 /* 110 * find/create a frag in the tree 111 */ 112 static struct ceph_inode_frag *__get_or_create_frag(struct ceph_inode_info *ci, 113 u32 f) 114 { 115 struct rb_node **p; 116 struct rb_node *parent = NULL; 117 struct ceph_inode_frag *frag; 118 int c; 119 120 p = &ci->i_fragtree.rb_node; 121 while (*p) { 122 parent = *p; 123 frag = rb_entry(parent, struct ceph_inode_frag, node); 124 c = ceph_frag_compare(f, frag->frag); 125 if (c < 0) 126 p = &(*p)->rb_left; 127 else if (c > 0) 128 p = &(*p)->rb_right; 129 else 130 return frag; 131 } 132 133 frag = kmalloc(sizeof(*frag), GFP_NOFS); 134 if (!frag) { 135 pr_err("__get_or_create_frag ENOMEM on %p %llx.%llx " 136 "frag %x\n", &ci->vfs_inode, 137 ceph_vinop(&ci->vfs_inode), f); 138 return ERR_PTR(-ENOMEM); 139 } 140 frag->frag = f; 141 frag->split_by = 0; 142 frag->mds = -1; 143 frag->ndist = 0; 144 145 rb_link_node(&frag->node, parent, p); 146 rb_insert_color(&frag->node, &ci->i_fragtree); 147 148 dout("get_or_create_frag added %llx.%llx frag %x\n", 149 ceph_vinop(&ci->vfs_inode), f); 150 return frag; 151 } 152 153 /* 154 * find a specific frag @f 155 */ 156 struct ceph_inode_frag *__ceph_find_frag(struct ceph_inode_info *ci, u32 f) 157 { 158 struct rb_node *n = ci->i_fragtree.rb_node; 159 160 while (n) { 161 struct ceph_inode_frag *frag = 162 rb_entry(n, struct ceph_inode_frag, node); 163 int c = ceph_frag_compare(f, frag->frag); 164 if (c < 0) 165 n = n->rb_left; 166 else if (c > 0) 167 n = n->rb_right; 168 else 169 return frag; 170 } 171 return NULL; 172 } 173 174 /* 175 * Choose frag containing the given value @v. If @pfrag is 176 * specified, copy the frag delegation info to the caller if 177 * it is present. 178 */ 179 u32 ceph_choose_frag(struct ceph_inode_info *ci, u32 v, 180 struct ceph_inode_frag *pfrag, 181 int *found) 182 { 183 u32 t = ceph_frag_make(0, 0); 184 struct ceph_inode_frag *frag; 185 unsigned nway, i; 186 u32 n; 187 188 if (found) 189 *found = 0; 190 191 mutex_lock(&ci->i_fragtree_mutex); 192 while (1) { 193 WARN_ON(!ceph_frag_contains_value(t, v)); 194 frag = __ceph_find_frag(ci, t); 195 if (!frag) 196 break; /* t is a leaf */ 197 if (frag->split_by == 0) { 198 if (pfrag) 199 memcpy(pfrag, frag, sizeof(*pfrag)); 200 if (found) 201 *found = 1; 202 break; 203 } 204 205 /* choose child */ 206 nway = 1 << frag->split_by; 207 dout("choose_frag(%x) %x splits by %d (%d ways)\n", v, t, 208 frag->split_by, nway); 209 for (i = 0; i < nway; i++) { 210 n = ceph_frag_make_child(t, frag->split_by, i); 211 if (ceph_frag_contains_value(n, v)) { 212 t = n; 213 break; 214 } 215 } 216 BUG_ON(i == nway); 217 } 218 dout("choose_frag(%x) = %x\n", v, t); 219 220 mutex_unlock(&ci->i_fragtree_mutex); 221 return t; 222 } 223 224 /* 225 * Process dirfrag (delegation) info from the mds. Include leaf 226 * fragment in tree ONLY if ndist > 0. Otherwise, only 227 * branches/splits are included in i_fragtree) 228 */ 229 static int ceph_fill_dirfrag(struct inode *inode, 230 struct ceph_mds_reply_dirfrag *dirinfo) 231 { 232 struct ceph_inode_info *ci = ceph_inode(inode); 233 struct ceph_inode_frag *frag; 234 u32 id = le32_to_cpu(dirinfo->frag); 235 int mds = le32_to_cpu(dirinfo->auth); 236 int ndist = le32_to_cpu(dirinfo->ndist); 237 int i; 238 int err = 0; 239 240 mutex_lock(&ci->i_fragtree_mutex); 241 if (ndist == 0) { 242 /* no delegation info needed. */ 243 frag = __ceph_find_frag(ci, id); 244 if (!frag) 245 goto out; 246 if (frag->split_by == 0) { 247 /* tree leaf, remove */ 248 dout("fill_dirfrag removed %llx.%llx frag %x" 249 " (no ref)\n", ceph_vinop(inode), id); 250 rb_erase(&frag->node, &ci->i_fragtree); 251 kfree(frag); 252 } else { 253 /* tree branch, keep and clear */ 254 dout("fill_dirfrag cleared %llx.%llx frag %x" 255 " referral\n", ceph_vinop(inode), id); 256 frag->mds = -1; 257 frag->ndist = 0; 258 } 259 goto out; 260 } 261 262 263 /* find/add this frag to store mds delegation info */ 264 frag = __get_or_create_frag(ci, id); 265 if (IS_ERR(frag)) { 266 /* this is not the end of the world; we can continue 267 with bad/inaccurate delegation info */ 268 pr_err("fill_dirfrag ENOMEM on mds ref %llx.%llx fg %x\n", 269 ceph_vinop(inode), le32_to_cpu(dirinfo->frag)); 270 err = -ENOMEM; 271 goto out; 272 } 273 274 frag->mds = mds; 275 frag->ndist = min_t(u32, ndist, CEPH_MAX_DIRFRAG_REP); 276 for (i = 0; i < frag->ndist; i++) 277 frag->dist[i] = le32_to_cpu(dirinfo->dist[i]); 278 dout("fill_dirfrag %llx.%llx frag %x ndist=%d\n", 279 ceph_vinop(inode), frag->frag, frag->ndist); 280 281 out: 282 mutex_unlock(&ci->i_fragtree_mutex); 283 return err; 284 } 285 286 287 /* 288 * initialize a newly allocated inode. 289 */ 290 struct inode *ceph_alloc_inode(struct super_block *sb) 291 { 292 struct ceph_inode_info *ci; 293 int i; 294 295 ci = kmem_cache_alloc(ceph_inode_cachep, GFP_NOFS); 296 if (!ci) 297 return NULL; 298 299 dout("alloc_inode %p\n", &ci->vfs_inode); 300 301 spin_lock_init(&ci->i_ceph_lock); 302 303 ci->i_version = 0; 304 ci->i_time_warp_seq = 0; 305 ci->i_ceph_flags = 0; 306 atomic_set(&ci->i_release_count, 1); 307 atomic_set(&ci->i_complete_count, 0); 308 ci->i_symlink = NULL; 309 310 memset(&ci->i_dir_layout, 0, sizeof(ci->i_dir_layout)); 311 312 ci->i_fragtree = RB_ROOT; 313 mutex_init(&ci->i_fragtree_mutex); 314 315 ci->i_xattrs.blob = NULL; 316 ci->i_xattrs.prealloc_blob = NULL; 317 ci->i_xattrs.dirty = false; 318 ci->i_xattrs.index = RB_ROOT; 319 ci->i_xattrs.count = 0; 320 ci->i_xattrs.names_size = 0; 321 ci->i_xattrs.vals_size = 0; 322 ci->i_xattrs.version = 0; 323 ci->i_xattrs.index_version = 0; 324 325 ci->i_caps = RB_ROOT; 326 ci->i_auth_cap = NULL; 327 ci->i_dirty_caps = 0; 328 ci->i_flushing_caps = 0; 329 INIT_LIST_HEAD(&ci->i_dirty_item); 330 INIT_LIST_HEAD(&ci->i_flushing_item); 331 ci->i_cap_flush_seq = 0; 332 ci->i_cap_flush_last_tid = 0; 333 memset(&ci->i_cap_flush_tid, 0, sizeof(ci->i_cap_flush_tid)); 334 init_waitqueue_head(&ci->i_cap_wq); 335 ci->i_hold_caps_min = 0; 336 ci->i_hold_caps_max = 0; 337 INIT_LIST_HEAD(&ci->i_cap_delay_list); 338 ci->i_cap_exporting_mds = 0; 339 ci->i_cap_exporting_mseq = 0; 340 ci->i_cap_exporting_issued = 0; 341 INIT_LIST_HEAD(&ci->i_cap_snaps); 342 ci->i_head_snapc = NULL; 343 ci->i_snap_caps = 0; 344 345 for (i = 0; i < CEPH_FILE_MODE_NUM; i++) 346 ci->i_nr_by_mode[i] = 0; 347 348 mutex_init(&ci->i_truncate_mutex); 349 ci->i_truncate_seq = 0; 350 ci->i_truncate_size = 0; 351 ci->i_truncate_pending = 0; 352 353 ci->i_max_size = 0; 354 ci->i_reported_size = 0; 355 ci->i_wanted_max_size = 0; 356 ci->i_requested_max_size = 0; 357 358 ci->i_pin_ref = 0; 359 ci->i_rd_ref = 0; 360 ci->i_rdcache_ref = 0; 361 ci->i_wr_ref = 0; 362 ci->i_wb_ref = 0; 363 ci->i_wrbuffer_ref = 0; 364 ci->i_wrbuffer_ref_head = 0; 365 ci->i_shared_gen = 0; 366 ci->i_rdcache_gen = 0; 367 ci->i_rdcache_revoking = 0; 368 369 INIT_LIST_HEAD(&ci->i_unsafe_writes); 370 INIT_LIST_HEAD(&ci->i_unsafe_dirops); 371 spin_lock_init(&ci->i_unsafe_lock); 372 373 ci->i_snap_realm = NULL; 374 INIT_LIST_HEAD(&ci->i_snap_realm_item); 375 INIT_LIST_HEAD(&ci->i_snap_flush_item); 376 377 INIT_WORK(&ci->i_wb_work, ceph_writeback_work); 378 INIT_WORK(&ci->i_pg_inv_work, ceph_invalidate_work); 379 380 INIT_WORK(&ci->i_vmtruncate_work, ceph_vmtruncate_work); 381 382 ceph_fscache_inode_init(ci); 383 384 return &ci->vfs_inode; 385 } 386 387 static void ceph_i_callback(struct rcu_head *head) 388 { 389 struct inode *inode = container_of(head, struct inode, i_rcu); 390 struct ceph_inode_info *ci = ceph_inode(inode); 391 392 kmem_cache_free(ceph_inode_cachep, ci); 393 } 394 395 void ceph_destroy_inode(struct inode *inode) 396 { 397 struct ceph_inode_info *ci = ceph_inode(inode); 398 struct ceph_inode_frag *frag; 399 struct rb_node *n; 400 401 dout("destroy_inode %p ino %llx.%llx\n", inode, ceph_vinop(inode)); 402 403 ceph_fscache_unregister_inode_cookie(ci); 404 405 ceph_queue_caps_release(inode); 406 407 /* 408 * we may still have a snap_realm reference if there are stray 409 * caps in i_cap_exporting_issued or i_snap_caps. 410 */ 411 if (ci->i_snap_realm) { 412 struct ceph_mds_client *mdsc = 413 ceph_sb_to_client(ci->vfs_inode.i_sb)->mdsc; 414 struct ceph_snap_realm *realm = ci->i_snap_realm; 415 416 dout(" dropping residual ref to snap realm %p\n", realm); 417 spin_lock(&realm->inodes_with_caps_lock); 418 list_del_init(&ci->i_snap_realm_item); 419 spin_unlock(&realm->inodes_with_caps_lock); 420 ceph_put_snap_realm(mdsc, realm); 421 } 422 423 kfree(ci->i_symlink); 424 while ((n = rb_first(&ci->i_fragtree)) != NULL) { 425 frag = rb_entry(n, struct ceph_inode_frag, node); 426 rb_erase(n, &ci->i_fragtree); 427 kfree(frag); 428 } 429 430 __ceph_destroy_xattrs(ci); 431 if (ci->i_xattrs.blob) 432 ceph_buffer_put(ci->i_xattrs.blob); 433 if (ci->i_xattrs.prealloc_blob) 434 ceph_buffer_put(ci->i_xattrs.prealloc_blob); 435 436 call_rcu(&inode->i_rcu, ceph_i_callback); 437 } 438 439 /* 440 * Helpers to fill in size, ctime, mtime, and atime. We have to be 441 * careful because either the client or MDS may have more up to date 442 * info, depending on which capabilities are held, and whether 443 * time_warp_seq or truncate_seq have increased. (Ordinarily, mtime 444 * and size are monotonically increasing, except when utimes() or 445 * truncate() increments the corresponding _seq values.) 446 */ 447 int ceph_fill_file_size(struct inode *inode, int issued, 448 u32 truncate_seq, u64 truncate_size, u64 size) 449 { 450 struct ceph_inode_info *ci = ceph_inode(inode); 451 int queue_trunc = 0; 452 453 if (ceph_seq_cmp(truncate_seq, ci->i_truncate_seq) > 0 || 454 (truncate_seq == ci->i_truncate_seq && size > inode->i_size)) { 455 dout("size %lld -> %llu\n", inode->i_size, size); 456 inode->i_size = size; 457 inode->i_blocks = (size + (1<<9) - 1) >> 9; 458 ci->i_reported_size = size; 459 if (truncate_seq != ci->i_truncate_seq) { 460 dout("truncate_seq %u -> %u\n", 461 ci->i_truncate_seq, truncate_seq); 462 ci->i_truncate_seq = truncate_seq; 463 464 /* the MDS should have revoked these caps */ 465 WARN_ON_ONCE(issued & (CEPH_CAP_FILE_EXCL | 466 CEPH_CAP_FILE_RD | 467 CEPH_CAP_FILE_WR | 468 CEPH_CAP_FILE_LAZYIO)); 469 /* 470 * If we hold relevant caps, or in the case where we're 471 * not the only client referencing this file and we 472 * don't hold those caps, then we need to check whether 473 * the file is either opened or mmaped 474 */ 475 if ((issued & (CEPH_CAP_FILE_CACHE| 476 CEPH_CAP_FILE_BUFFER)) || 477 mapping_mapped(inode->i_mapping) || 478 __ceph_caps_file_wanted(ci)) { 479 ci->i_truncate_pending++; 480 queue_trunc = 1; 481 } 482 } 483 } 484 if (ceph_seq_cmp(truncate_seq, ci->i_truncate_seq) >= 0 && 485 ci->i_truncate_size != truncate_size) { 486 dout("truncate_size %lld -> %llu\n", ci->i_truncate_size, 487 truncate_size); 488 ci->i_truncate_size = truncate_size; 489 } 490 491 if (queue_trunc) 492 ceph_fscache_invalidate(inode); 493 494 return queue_trunc; 495 } 496 497 void ceph_fill_file_time(struct inode *inode, int issued, 498 u64 time_warp_seq, struct timespec *ctime, 499 struct timespec *mtime, struct timespec *atime) 500 { 501 struct ceph_inode_info *ci = ceph_inode(inode); 502 int warn = 0; 503 504 if (issued & (CEPH_CAP_FILE_EXCL| 505 CEPH_CAP_FILE_WR| 506 CEPH_CAP_FILE_BUFFER| 507 CEPH_CAP_AUTH_EXCL| 508 CEPH_CAP_XATTR_EXCL)) { 509 if (timespec_compare(ctime, &inode->i_ctime) > 0) { 510 dout("ctime %ld.%09ld -> %ld.%09ld inc w/ cap\n", 511 inode->i_ctime.tv_sec, inode->i_ctime.tv_nsec, 512 ctime->tv_sec, ctime->tv_nsec); 513 inode->i_ctime = *ctime; 514 } 515 if (ceph_seq_cmp(time_warp_seq, ci->i_time_warp_seq) > 0) { 516 /* the MDS did a utimes() */ 517 dout("mtime %ld.%09ld -> %ld.%09ld " 518 "tw %d -> %d\n", 519 inode->i_mtime.tv_sec, inode->i_mtime.tv_nsec, 520 mtime->tv_sec, mtime->tv_nsec, 521 ci->i_time_warp_seq, (int)time_warp_seq); 522 523 inode->i_mtime = *mtime; 524 inode->i_atime = *atime; 525 ci->i_time_warp_seq = time_warp_seq; 526 } else if (time_warp_seq == ci->i_time_warp_seq) { 527 /* nobody did utimes(); take the max */ 528 if (timespec_compare(mtime, &inode->i_mtime) > 0) { 529 dout("mtime %ld.%09ld -> %ld.%09ld inc\n", 530 inode->i_mtime.tv_sec, 531 inode->i_mtime.tv_nsec, 532 mtime->tv_sec, mtime->tv_nsec); 533 inode->i_mtime = *mtime; 534 } 535 if (timespec_compare(atime, &inode->i_atime) > 0) { 536 dout("atime %ld.%09ld -> %ld.%09ld inc\n", 537 inode->i_atime.tv_sec, 538 inode->i_atime.tv_nsec, 539 atime->tv_sec, atime->tv_nsec); 540 inode->i_atime = *atime; 541 } 542 } else if (issued & CEPH_CAP_FILE_EXCL) { 543 /* we did a utimes(); ignore mds values */ 544 } else { 545 warn = 1; 546 } 547 } else { 548 /* we have no write|excl caps; whatever the MDS says is true */ 549 if (ceph_seq_cmp(time_warp_seq, ci->i_time_warp_seq) >= 0) { 550 inode->i_ctime = *ctime; 551 inode->i_mtime = *mtime; 552 inode->i_atime = *atime; 553 ci->i_time_warp_seq = time_warp_seq; 554 } else { 555 warn = 1; 556 } 557 } 558 if (warn) /* time_warp_seq shouldn't go backwards */ 559 dout("%p mds time_warp_seq %llu < %u\n", 560 inode, time_warp_seq, ci->i_time_warp_seq); 561 } 562 563 /* 564 * Populate an inode based on info from mds. May be called on new or 565 * existing inodes. 566 */ 567 static int fill_inode(struct inode *inode, 568 struct ceph_mds_reply_info_in *iinfo, 569 struct ceph_mds_reply_dirfrag *dirinfo, 570 struct ceph_mds_session *session, 571 unsigned long ttl_from, int cap_fmode, 572 struct ceph_cap_reservation *caps_reservation) 573 { 574 struct ceph_mds_reply_inode *info = iinfo->in; 575 struct ceph_inode_info *ci = ceph_inode(inode); 576 int i; 577 int issued = 0, implemented; 578 struct timespec mtime, atime, ctime; 579 u32 nsplits; 580 struct ceph_inode_frag *frag; 581 struct rb_node *rb_node; 582 struct ceph_buffer *xattr_blob = NULL; 583 int err = 0; 584 int queue_trunc = 0; 585 586 dout("fill_inode %p ino %llx.%llx v %llu had %llu\n", 587 inode, ceph_vinop(inode), le64_to_cpu(info->version), 588 ci->i_version); 589 590 /* 591 * prealloc xattr data, if it looks like we'll need it. only 592 * if len > 4 (meaning there are actually xattrs; the first 4 593 * bytes are the xattr count). 594 */ 595 if (iinfo->xattr_len > 4) { 596 xattr_blob = ceph_buffer_new(iinfo->xattr_len, GFP_NOFS); 597 if (!xattr_blob) 598 pr_err("fill_inode ENOMEM xattr blob %d bytes\n", 599 iinfo->xattr_len); 600 } 601 602 spin_lock(&ci->i_ceph_lock); 603 604 /* 605 * provided version will be odd if inode value is projected, 606 * even if stable. skip the update if we have newer stable 607 * info (ours>=theirs, e.g. due to racing mds replies), unless 608 * we are getting projected (unstable) info (in which case the 609 * version is odd, and we want ours>theirs). 610 * us them 611 * 2 2 skip 612 * 3 2 skip 613 * 3 3 update 614 */ 615 if (le64_to_cpu(info->version) > 0 && 616 (ci->i_version & ~1) >= le64_to_cpu(info->version)) 617 goto no_change; 618 619 issued = __ceph_caps_issued(ci, &implemented); 620 issued |= implemented | __ceph_caps_dirty(ci); 621 622 /* update inode */ 623 ci->i_version = le64_to_cpu(info->version); 624 inode->i_version++; 625 inode->i_rdev = le32_to_cpu(info->rdev); 626 627 if ((issued & CEPH_CAP_AUTH_EXCL) == 0) { 628 inode->i_mode = le32_to_cpu(info->mode); 629 inode->i_uid = make_kuid(&init_user_ns, le32_to_cpu(info->uid)); 630 inode->i_gid = make_kgid(&init_user_ns, le32_to_cpu(info->gid)); 631 dout("%p mode 0%o uid.gid %d.%d\n", inode, inode->i_mode, 632 from_kuid(&init_user_ns, inode->i_uid), 633 from_kgid(&init_user_ns, inode->i_gid)); 634 } 635 636 if ((issued & CEPH_CAP_LINK_EXCL) == 0) 637 set_nlink(inode, le32_to_cpu(info->nlink)); 638 639 /* be careful with mtime, atime, size */ 640 ceph_decode_timespec(&atime, &info->atime); 641 ceph_decode_timespec(&mtime, &info->mtime); 642 ceph_decode_timespec(&ctime, &info->ctime); 643 queue_trunc = ceph_fill_file_size(inode, issued, 644 le32_to_cpu(info->truncate_seq), 645 le64_to_cpu(info->truncate_size), 646 le64_to_cpu(info->size)); 647 ceph_fill_file_time(inode, issued, 648 le32_to_cpu(info->time_warp_seq), 649 &ctime, &mtime, &atime); 650 651 /* only update max_size on auth cap */ 652 if ((info->cap.flags & CEPH_CAP_FLAG_AUTH) && 653 ci->i_max_size != le64_to_cpu(info->max_size)) { 654 dout("max_size %lld -> %llu\n", ci->i_max_size, 655 le64_to_cpu(info->max_size)); 656 ci->i_max_size = le64_to_cpu(info->max_size); 657 } 658 659 ci->i_layout = info->layout; 660 inode->i_blkbits = fls(le32_to_cpu(info->layout.fl_stripe_unit)) - 1; 661 662 /* xattrs */ 663 /* note that if i_xattrs.len <= 4, i_xattrs.data will still be NULL. */ 664 if ((issued & CEPH_CAP_XATTR_EXCL) == 0 && 665 le64_to_cpu(info->xattr_version) > ci->i_xattrs.version) { 666 if (ci->i_xattrs.blob) 667 ceph_buffer_put(ci->i_xattrs.blob); 668 ci->i_xattrs.blob = xattr_blob; 669 if (xattr_blob) 670 memcpy(ci->i_xattrs.blob->vec.iov_base, 671 iinfo->xattr_data, iinfo->xattr_len); 672 ci->i_xattrs.version = le64_to_cpu(info->xattr_version); 673 xattr_blob = NULL; 674 } 675 676 inode->i_mapping->a_ops = &ceph_aops; 677 inode->i_mapping->backing_dev_info = 678 &ceph_sb_to_client(inode->i_sb)->backing_dev_info; 679 680 switch (inode->i_mode & S_IFMT) { 681 case S_IFIFO: 682 case S_IFBLK: 683 case S_IFCHR: 684 case S_IFSOCK: 685 init_special_inode(inode, inode->i_mode, inode->i_rdev); 686 inode->i_op = &ceph_file_iops; 687 break; 688 case S_IFREG: 689 inode->i_op = &ceph_file_iops; 690 inode->i_fop = &ceph_file_fops; 691 break; 692 case S_IFLNK: 693 inode->i_op = &ceph_symlink_iops; 694 if (!ci->i_symlink) { 695 u32 symlen = iinfo->symlink_len; 696 char *sym; 697 698 spin_unlock(&ci->i_ceph_lock); 699 700 err = -EINVAL; 701 if (WARN_ON(symlen != inode->i_size)) 702 goto out; 703 704 err = -ENOMEM; 705 sym = kstrndup(iinfo->symlink, symlen, GFP_NOFS); 706 if (!sym) 707 goto out; 708 709 spin_lock(&ci->i_ceph_lock); 710 if (!ci->i_symlink) 711 ci->i_symlink = sym; 712 else 713 kfree(sym); /* lost a race */ 714 } 715 break; 716 case S_IFDIR: 717 inode->i_op = &ceph_dir_iops; 718 inode->i_fop = &ceph_dir_fops; 719 720 ci->i_dir_layout = iinfo->dir_layout; 721 722 ci->i_files = le64_to_cpu(info->files); 723 ci->i_subdirs = le64_to_cpu(info->subdirs); 724 ci->i_rbytes = le64_to_cpu(info->rbytes); 725 ci->i_rfiles = le64_to_cpu(info->rfiles); 726 ci->i_rsubdirs = le64_to_cpu(info->rsubdirs); 727 ceph_decode_timespec(&ci->i_rctime, &info->rctime); 728 break; 729 default: 730 pr_err("fill_inode %llx.%llx BAD mode 0%o\n", 731 ceph_vinop(inode), inode->i_mode); 732 } 733 734 /* set dir completion flag? */ 735 if (S_ISDIR(inode->i_mode) && 736 ci->i_files == 0 && ci->i_subdirs == 0 && 737 ceph_snap(inode) == CEPH_NOSNAP && 738 (le32_to_cpu(info->cap.caps) & CEPH_CAP_FILE_SHARED) && 739 (issued & CEPH_CAP_FILE_EXCL) == 0 && 740 !__ceph_dir_is_complete(ci)) { 741 dout(" marking %p complete (empty)\n", inode); 742 __ceph_dir_set_complete(ci, atomic_read(&ci->i_release_count)); 743 ci->i_max_offset = 2; 744 } 745 no_change: 746 spin_unlock(&ci->i_ceph_lock); 747 748 /* queue truncate if we saw i_size decrease */ 749 if (queue_trunc) 750 ceph_queue_vmtruncate(inode); 751 752 /* populate frag tree */ 753 /* FIXME: move me up, if/when version reflects fragtree changes */ 754 nsplits = le32_to_cpu(info->fragtree.nsplits); 755 mutex_lock(&ci->i_fragtree_mutex); 756 rb_node = rb_first(&ci->i_fragtree); 757 for (i = 0; i < nsplits; i++) { 758 u32 id = le32_to_cpu(info->fragtree.splits[i].frag); 759 frag = NULL; 760 while (rb_node) { 761 frag = rb_entry(rb_node, struct ceph_inode_frag, node); 762 if (ceph_frag_compare(frag->frag, id) >= 0) { 763 if (frag->frag != id) 764 frag = NULL; 765 else 766 rb_node = rb_next(rb_node); 767 break; 768 } 769 rb_node = rb_next(rb_node); 770 rb_erase(&frag->node, &ci->i_fragtree); 771 kfree(frag); 772 frag = NULL; 773 } 774 if (!frag) { 775 frag = __get_or_create_frag(ci, id); 776 if (IS_ERR(frag)) 777 continue; 778 } 779 frag->split_by = le32_to_cpu(info->fragtree.splits[i].by); 780 dout(" frag %x split by %d\n", frag->frag, frag->split_by); 781 } 782 while (rb_node) { 783 frag = rb_entry(rb_node, struct ceph_inode_frag, node); 784 rb_node = rb_next(rb_node); 785 rb_erase(&frag->node, &ci->i_fragtree); 786 kfree(frag); 787 } 788 mutex_unlock(&ci->i_fragtree_mutex); 789 790 /* were we issued a capability? */ 791 if (info->cap.caps) { 792 if (ceph_snap(inode) == CEPH_NOSNAP) { 793 ceph_add_cap(inode, session, 794 le64_to_cpu(info->cap.cap_id), 795 cap_fmode, 796 le32_to_cpu(info->cap.caps), 797 le32_to_cpu(info->cap.wanted), 798 le32_to_cpu(info->cap.seq), 799 le32_to_cpu(info->cap.mseq), 800 le64_to_cpu(info->cap.realm), 801 info->cap.flags, 802 caps_reservation); 803 } else { 804 spin_lock(&ci->i_ceph_lock); 805 dout(" %p got snap_caps %s\n", inode, 806 ceph_cap_string(le32_to_cpu(info->cap.caps))); 807 ci->i_snap_caps |= le32_to_cpu(info->cap.caps); 808 if (cap_fmode >= 0) 809 __ceph_get_fmode(ci, cap_fmode); 810 spin_unlock(&ci->i_ceph_lock); 811 } 812 } else if (cap_fmode >= 0) { 813 pr_warning("mds issued no caps on %llx.%llx\n", 814 ceph_vinop(inode)); 815 __ceph_get_fmode(ci, cap_fmode); 816 } 817 818 /* update delegation info? */ 819 if (dirinfo) 820 ceph_fill_dirfrag(inode, dirinfo); 821 822 err = 0; 823 824 out: 825 if (xattr_blob) 826 ceph_buffer_put(xattr_blob); 827 return err; 828 } 829 830 /* 831 * caller should hold session s_mutex. 832 */ 833 static void update_dentry_lease(struct dentry *dentry, 834 struct ceph_mds_reply_lease *lease, 835 struct ceph_mds_session *session, 836 unsigned long from_time) 837 { 838 struct ceph_dentry_info *di = ceph_dentry(dentry); 839 long unsigned duration = le32_to_cpu(lease->duration_ms); 840 long unsigned ttl = from_time + (duration * HZ) / 1000; 841 long unsigned half_ttl = from_time + (duration * HZ / 2) / 1000; 842 struct inode *dir; 843 844 /* only track leases on regular dentries */ 845 if (dentry->d_op != &ceph_dentry_ops) 846 return; 847 848 spin_lock(&dentry->d_lock); 849 dout("update_dentry_lease %p duration %lu ms ttl %lu\n", 850 dentry, duration, ttl); 851 852 /* make lease_rdcache_gen match directory */ 853 dir = dentry->d_parent->d_inode; 854 di->lease_shared_gen = ceph_inode(dir)->i_shared_gen; 855 856 if (duration == 0) 857 goto out_unlock; 858 859 if (di->lease_gen == session->s_cap_gen && 860 time_before(ttl, dentry->d_time)) 861 goto out_unlock; /* we already have a newer lease. */ 862 863 if (di->lease_session && di->lease_session != session) 864 goto out_unlock; 865 866 ceph_dentry_lru_touch(dentry); 867 868 if (!di->lease_session) 869 di->lease_session = ceph_get_mds_session(session); 870 di->lease_gen = session->s_cap_gen; 871 di->lease_seq = le32_to_cpu(lease->seq); 872 di->lease_renew_after = half_ttl; 873 di->lease_renew_from = 0; 874 dentry->d_time = ttl; 875 out_unlock: 876 spin_unlock(&dentry->d_lock); 877 return; 878 } 879 880 /* 881 * Set dentry's directory position based on the current dir's max, and 882 * order it in d_subdirs, so that dcache_readdir behaves. 883 * 884 * Always called under directory's i_mutex. 885 */ 886 static void ceph_set_dentry_offset(struct dentry *dn) 887 { 888 struct dentry *dir = dn->d_parent; 889 struct inode *inode = dir->d_inode; 890 struct ceph_inode_info *ci; 891 struct ceph_dentry_info *di; 892 893 BUG_ON(!inode); 894 895 ci = ceph_inode(inode); 896 di = ceph_dentry(dn); 897 898 spin_lock(&ci->i_ceph_lock); 899 if (!__ceph_dir_is_complete(ci)) { 900 spin_unlock(&ci->i_ceph_lock); 901 return; 902 } 903 di->offset = ceph_inode(inode)->i_max_offset++; 904 spin_unlock(&ci->i_ceph_lock); 905 906 spin_lock(&dir->d_lock); 907 spin_lock_nested(&dn->d_lock, DENTRY_D_LOCK_NESTED); 908 list_move(&dn->d_u.d_child, &dir->d_subdirs); 909 dout("set_dentry_offset %p %lld (%p %p)\n", dn, di->offset, 910 dn->d_u.d_child.prev, dn->d_u.d_child.next); 911 spin_unlock(&dn->d_lock); 912 spin_unlock(&dir->d_lock); 913 } 914 915 /* 916 * splice a dentry to an inode. 917 * caller must hold directory i_mutex for this to be safe. 918 * 919 * we will only rehash the resulting dentry if @prehash is 920 * true; @prehash will be set to false (for the benefit of 921 * the caller) if we fail. 922 */ 923 static struct dentry *splice_dentry(struct dentry *dn, struct inode *in, 924 bool *prehash, bool set_offset) 925 { 926 struct dentry *realdn; 927 928 BUG_ON(dn->d_inode); 929 930 /* dn must be unhashed */ 931 if (!d_unhashed(dn)) 932 d_drop(dn); 933 realdn = d_materialise_unique(dn, in); 934 if (IS_ERR(realdn)) { 935 pr_err("splice_dentry error %ld %p inode %p ino %llx.%llx\n", 936 PTR_ERR(realdn), dn, in, ceph_vinop(in)); 937 if (prehash) 938 *prehash = false; /* don't rehash on error */ 939 dn = realdn; /* note realdn contains the error */ 940 goto out; 941 } else if (realdn) { 942 dout("dn %p (%d) spliced with %p (%d) " 943 "inode %p ino %llx.%llx\n", 944 dn, d_count(dn), 945 realdn, d_count(realdn), 946 realdn->d_inode, ceph_vinop(realdn->d_inode)); 947 dput(dn); 948 dn = realdn; 949 } else { 950 BUG_ON(!ceph_dentry(dn)); 951 dout("dn %p attached to %p ino %llx.%llx\n", 952 dn, dn->d_inode, ceph_vinop(dn->d_inode)); 953 } 954 if ((!prehash || *prehash) && d_unhashed(dn)) 955 d_rehash(dn); 956 if (set_offset) 957 ceph_set_dentry_offset(dn); 958 out: 959 return dn; 960 } 961 962 /* 963 * Incorporate results into the local cache. This is either just 964 * one inode, or a directory, dentry, and possibly linked-to inode (e.g., 965 * after a lookup). 966 * 967 * A reply may contain 968 * a directory inode along with a dentry. 969 * and/or a target inode 970 * 971 * Called with snap_rwsem (read). 972 */ 973 int ceph_fill_trace(struct super_block *sb, struct ceph_mds_request *req, 974 struct ceph_mds_session *session) 975 { 976 struct ceph_mds_reply_info_parsed *rinfo = &req->r_reply_info; 977 struct inode *in = NULL; 978 struct ceph_mds_reply_inode *ininfo; 979 struct ceph_vino vino; 980 struct ceph_fs_client *fsc = ceph_sb_to_client(sb); 981 int i = 0; 982 int err = 0; 983 984 dout("fill_trace %p is_dentry %d is_target %d\n", req, 985 rinfo->head->is_dentry, rinfo->head->is_target); 986 987 #if 0 988 /* 989 * Debugging hook: 990 * 991 * If we resend completed ops to a recovering mds, we get no 992 * trace. Since that is very rare, pretend this is the case 993 * to ensure the 'no trace' handlers in the callers behave. 994 * 995 * Fill in inodes unconditionally to avoid breaking cap 996 * invariants. 997 */ 998 if (rinfo->head->op & CEPH_MDS_OP_WRITE) { 999 pr_info("fill_trace faking empty trace on %lld %s\n", 1000 req->r_tid, ceph_mds_op_name(rinfo->head->op)); 1001 if (rinfo->head->is_dentry) { 1002 rinfo->head->is_dentry = 0; 1003 err = fill_inode(req->r_locked_dir, 1004 &rinfo->diri, rinfo->dirfrag, 1005 session, req->r_request_started, -1); 1006 } 1007 if (rinfo->head->is_target) { 1008 rinfo->head->is_target = 0; 1009 ininfo = rinfo->targeti.in; 1010 vino.ino = le64_to_cpu(ininfo->ino); 1011 vino.snap = le64_to_cpu(ininfo->snapid); 1012 in = ceph_get_inode(sb, vino); 1013 err = fill_inode(in, &rinfo->targeti, NULL, 1014 session, req->r_request_started, 1015 req->r_fmode); 1016 iput(in); 1017 } 1018 } 1019 #endif 1020 1021 if (!rinfo->head->is_target && !rinfo->head->is_dentry) { 1022 dout("fill_trace reply is empty!\n"); 1023 if (rinfo->head->result == 0 && req->r_locked_dir) 1024 ceph_invalidate_dir_request(req); 1025 return 0; 1026 } 1027 1028 if (rinfo->head->is_dentry) { 1029 struct inode *dir = req->r_locked_dir; 1030 1031 if (dir) { 1032 err = fill_inode(dir, &rinfo->diri, rinfo->dirfrag, 1033 session, req->r_request_started, -1, 1034 &req->r_caps_reservation); 1035 if (err < 0) 1036 return err; 1037 } else { 1038 WARN_ON_ONCE(1); 1039 } 1040 } 1041 1042 /* 1043 * ignore null lease/binding on snapdir ENOENT, or else we 1044 * will have trouble splicing in the virtual snapdir later 1045 */ 1046 if (rinfo->head->is_dentry && !req->r_aborted && 1047 req->r_locked_dir && 1048 (rinfo->head->is_target || strncmp(req->r_dentry->d_name.name, 1049 fsc->mount_options->snapdir_name, 1050 req->r_dentry->d_name.len))) { 1051 /* 1052 * lookup link rename : null -> possibly existing inode 1053 * mknod symlink mkdir : null -> new inode 1054 * unlink : linked -> null 1055 */ 1056 struct inode *dir = req->r_locked_dir; 1057 struct dentry *dn = req->r_dentry; 1058 bool have_dir_cap, have_lease; 1059 1060 BUG_ON(!dn); 1061 BUG_ON(!dir); 1062 BUG_ON(dn->d_parent->d_inode != dir); 1063 BUG_ON(ceph_ino(dir) != 1064 le64_to_cpu(rinfo->diri.in->ino)); 1065 BUG_ON(ceph_snap(dir) != 1066 le64_to_cpu(rinfo->diri.in->snapid)); 1067 1068 /* do we have a lease on the whole dir? */ 1069 have_dir_cap = 1070 (le32_to_cpu(rinfo->diri.in->cap.caps) & 1071 CEPH_CAP_FILE_SHARED); 1072 1073 /* do we have a dn lease? */ 1074 have_lease = have_dir_cap || 1075 le32_to_cpu(rinfo->dlease->duration_ms); 1076 if (!have_lease) 1077 dout("fill_trace no dentry lease or dir cap\n"); 1078 1079 /* rename? */ 1080 if (req->r_old_dentry && req->r_op == CEPH_MDS_OP_RENAME) { 1081 dout(" src %p '%.*s' dst %p '%.*s'\n", 1082 req->r_old_dentry, 1083 req->r_old_dentry->d_name.len, 1084 req->r_old_dentry->d_name.name, 1085 dn, dn->d_name.len, dn->d_name.name); 1086 dout("fill_trace doing d_move %p -> %p\n", 1087 req->r_old_dentry, dn); 1088 1089 d_move(req->r_old_dentry, dn); 1090 dout(" src %p '%.*s' dst %p '%.*s'\n", 1091 req->r_old_dentry, 1092 req->r_old_dentry->d_name.len, 1093 req->r_old_dentry->d_name.name, 1094 dn, dn->d_name.len, dn->d_name.name); 1095 1096 /* ensure target dentry is invalidated, despite 1097 rehashing bug in vfs_rename_dir */ 1098 ceph_invalidate_dentry_lease(dn); 1099 1100 /* 1101 * d_move() puts the renamed dentry at the end of 1102 * d_subdirs. We need to assign it an appropriate 1103 * directory offset so we can behave when dir is 1104 * complete. 1105 */ 1106 ceph_set_dentry_offset(req->r_old_dentry); 1107 dout("dn %p gets new offset %lld\n", req->r_old_dentry, 1108 ceph_dentry(req->r_old_dentry)->offset); 1109 1110 dn = req->r_old_dentry; /* use old_dentry */ 1111 in = dn->d_inode; 1112 } 1113 1114 /* null dentry? */ 1115 if (!rinfo->head->is_target) { 1116 dout("fill_trace null dentry\n"); 1117 if (dn->d_inode) { 1118 dout("d_delete %p\n", dn); 1119 d_delete(dn); 1120 } else { 1121 dout("d_instantiate %p NULL\n", dn); 1122 d_instantiate(dn, NULL); 1123 if (have_lease && d_unhashed(dn)) 1124 d_rehash(dn); 1125 update_dentry_lease(dn, rinfo->dlease, 1126 session, 1127 req->r_request_started); 1128 } 1129 goto done; 1130 } 1131 1132 /* attach proper inode */ 1133 ininfo = rinfo->targeti.in; 1134 vino.ino = le64_to_cpu(ininfo->ino); 1135 vino.snap = le64_to_cpu(ininfo->snapid); 1136 in = dn->d_inode; 1137 if (!in) { 1138 in = ceph_get_inode(sb, vino); 1139 if (IS_ERR(in)) { 1140 pr_err("fill_trace bad get_inode " 1141 "%llx.%llx\n", vino.ino, vino.snap); 1142 err = PTR_ERR(in); 1143 d_drop(dn); 1144 goto done; 1145 } 1146 dn = splice_dentry(dn, in, &have_lease, true); 1147 if (IS_ERR(dn)) { 1148 err = PTR_ERR(dn); 1149 goto done; 1150 } 1151 req->r_dentry = dn; /* may have spliced */ 1152 ihold(in); 1153 } else if (ceph_ino(in) == vino.ino && 1154 ceph_snap(in) == vino.snap) { 1155 ihold(in); 1156 } else { 1157 dout(" %p links to %p %llx.%llx, not %llx.%llx\n", 1158 dn, in, ceph_ino(in), ceph_snap(in), 1159 vino.ino, vino.snap); 1160 have_lease = false; 1161 in = NULL; 1162 } 1163 1164 if (have_lease) 1165 update_dentry_lease(dn, rinfo->dlease, session, 1166 req->r_request_started); 1167 dout(" final dn %p\n", dn); 1168 i++; 1169 } else if ((req->r_op == CEPH_MDS_OP_LOOKUPSNAP || 1170 req->r_op == CEPH_MDS_OP_MKSNAP) && !req->r_aborted) { 1171 struct dentry *dn = req->r_dentry; 1172 1173 /* fill out a snapdir LOOKUPSNAP dentry */ 1174 BUG_ON(!dn); 1175 BUG_ON(!req->r_locked_dir); 1176 BUG_ON(ceph_snap(req->r_locked_dir) != CEPH_SNAPDIR); 1177 ininfo = rinfo->targeti.in; 1178 vino.ino = le64_to_cpu(ininfo->ino); 1179 vino.snap = le64_to_cpu(ininfo->snapid); 1180 in = ceph_get_inode(sb, vino); 1181 if (IS_ERR(in)) { 1182 pr_err("fill_inode get_inode badness %llx.%llx\n", 1183 vino.ino, vino.snap); 1184 err = PTR_ERR(in); 1185 d_delete(dn); 1186 goto done; 1187 } 1188 dout(" linking snapped dir %p to dn %p\n", in, dn); 1189 dn = splice_dentry(dn, in, NULL, true); 1190 if (IS_ERR(dn)) { 1191 err = PTR_ERR(dn); 1192 goto done; 1193 } 1194 req->r_dentry = dn; /* may have spliced */ 1195 ihold(in); 1196 rinfo->head->is_dentry = 1; /* fool notrace handlers */ 1197 } 1198 1199 if (rinfo->head->is_target) { 1200 vino.ino = le64_to_cpu(rinfo->targeti.in->ino); 1201 vino.snap = le64_to_cpu(rinfo->targeti.in->snapid); 1202 1203 if (in == NULL || ceph_ino(in) != vino.ino || 1204 ceph_snap(in) != vino.snap) { 1205 in = ceph_get_inode(sb, vino); 1206 if (IS_ERR(in)) { 1207 err = PTR_ERR(in); 1208 goto done; 1209 } 1210 } 1211 req->r_target_inode = in; 1212 1213 err = fill_inode(in, 1214 &rinfo->targeti, NULL, 1215 session, req->r_request_started, 1216 (le32_to_cpu(rinfo->head->result) == 0) ? 1217 req->r_fmode : -1, 1218 &req->r_caps_reservation); 1219 if (err < 0) { 1220 pr_err("fill_inode badness %p %llx.%llx\n", 1221 in, ceph_vinop(in)); 1222 goto done; 1223 } 1224 } 1225 1226 done: 1227 dout("fill_trace done err=%d\n", err); 1228 return err; 1229 } 1230 1231 /* 1232 * Prepopulate our cache with readdir results, leases, etc. 1233 */ 1234 static int readdir_prepopulate_inodes_only(struct ceph_mds_request *req, 1235 struct ceph_mds_session *session) 1236 { 1237 struct ceph_mds_reply_info_parsed *rinfo = &req->r_reply_info; 1238 int i, err = 0; 1239 1240 for (i = 0; i < rinfo->dir_nr; i++) { 1241 struct ceph_vino vino; 1242 struct inode *in; 1243 int rc; 1244 1245 vino.ino = le64_to_cpu(rinfo->dir_in[i].in->ino); 1246 vino.snap = le64_to_cpu(rinfo->dir_in[i].in->snapid); 1247 1248 in = ceph_get_inode(req->r_dentry->d_sb, vino); 1249 if (IS_ERR(in)) { 1250 err = PTR_ERR(in); 1251 dout("new_inode badness got %d\n", err); 1252 continue; 1253 } 1254 rc = fill_inode(in, &rinfo->dir_in[i], NULL, session, 1255 req->r_request_started, -1, 1256 &req->r_caps_reservation); 1257 if (rc < 0) { 1258 pr_err("fill_inode badness on %p got %d\n", in, rc); 1259 err = rc; 1260 continue; 1261 } 1262 } 1263 1264 return err; 1265 } 1266 1267 int ceph_readdir_prepopulate(struct ceph_mds_request *req, 1268 struct ceph_mds_session *session) 1269 { 1270 struct dentry *parent = req->r_dentry; 1271 struct ceph_mds_reply_info_parsed *rinfo = &req->r_reply_info; 1272 struct qstr dname; 1273 struct dentry *dn; 1274 struct inode *in; 1275 int err = 0, i; 1276 struct inode *snapdir = NULL; 1277 struct ceph_mds_request_head *rhead = req->r_request->front.iov_base; 1278 struct ceph_dentry_info *di; 1279 u64 r_readdir_offset = req->r_readdir_offset; 1280 u32 frag = le32_to_cpu(rhead->args.readdir.frag); 1281 1282 if (rinfo->dir_dir && 1283 le32_to_cpu(rinfo->dir_dir->frag) != frag) { 1284 dout("readdir_prepopulate got new frag %x -> %x\n", 1285 frag, le32_to_cpu(rinfo->dir_dir->frag)); 1286 frag = le32_to_cpu(rinfo->dir_dir->frag); 1287 if (ceph_frag_is_leftmost(frag)) 1288 r_readdir_offset = 2; 1289 else 1290 r_readdir_offset = 0; 1291 } 1292 1293 if (req->r_aborted) 1294 return readdir_prepopulate_inodes_only(req, session); 1295 1296 if (le32_to_cpu(rinfo->head->op) == CEPH_MDS_OP_LSSNAP) { 1297 snapdir = ceph_get_snapdir(parent->d_inode); 1298 parent = d_find_alias(snapdir); 1299 dout("readdir_prepopulate %d items under SNAPDIR dn %p\n", 1300 rinfo->dir_nr, parent); 1301 } else { 1302 dout("readdir_prepopulate %d items under dn %p\n", 1303 rinfo->dir_nr, parent); 1304 if (rinfo->dir_dir) 1305 ceph_fill_dirfrag(parent->d_inode, rinfo->dir_dir); 1306 } 1307 1308 for (i = 0; i < rinfo->dir_nr; i++) { 1309 struct ceph_vino vino; 1310 1311 dname.name = rinfo->dir_dname[i]; 1312 dname.len = rinfo->dir_dname_len[i]; 1313 dname.hash = full_name_hash(dname.name, dname.len); 1314 1315 vino.ino = le64_to_cpu(rinfo->dir_in[i].in->ino); 1316 vino.snap = le64_to_cpu(rinfo->dir_in[i].in->snapid); 1317 1318 retry_lookup: 1319 dn = d_lookup(parent, &dname); 1320 dout("d_lookup on parent=%p name=%.*s got %p\n", 1321 parent, dname.len, dname.name, dn); 1322 1323 if (!dn) { 1324 dn = d_alloc(parent, &dname); 1325 dout("d_alloc %p '%.*s' = %p\n", parent, 1326 dname.len, dname.name, dn); 1327 if (dn == NULL) { 1328 dout("d_alloc badness\n"); 1329 err = -ENOMEM; 1330 goto out; 1331 } 1332 err = ceph_init_dentry(dn); 1333 if (err < 0) { 1334 dput(dn); 1335 goto out; 1336 } 1337 } else if (dn->d_inode && 1338 (ceph_ino(dn->d_inode) != vino.ino || 1339 ceph_snap(dn->d_inode) != vino.snap)) { 1340 dout(" dn %p points to wrong inode %p\n", 1341 dn, dn->d_inode); 1342 d_delete(dn); 1343 dput(dn); 1344 goto retry_lookup; 1345 } else { 1346 /* reorder parent's d_subdirs */ 1347 spin_lock(&parent->d_lock); 1348 spin_lock_nested(&dn->d_lock, DENTRY_D_LOCK_NESTED); 1349 list_move(&dn->d_u.d_child, &parent->d_subdirs); 1350 spin_unlock(&dn->d_lock); 1351 spin_unlock(&parent->d_lock); 1352 } 1353 1354 di = dn->d_fsdata; 1355 di->offset = ceph_make_fpos(frag, i + r_readdir_offset); 1356 1357 /* inode */ 1358 if (dn->d_inode) { 1359 in = dn->d_inode; 1360 } else { 1361 in = ceph_get_inode(parent->d_sb, vino); 1362 if (IS_ERR(in)) { 1363 dout("new_inode badness\n"); 1364 d_drop(dn); 1365 dput(dn); 1366 err = PTR_ERR(in); 1367 goto out; 1368 } 1369 dn = splice_dentry(dn, in, NULL, false); 1370 if (IS_ERR(dn)) 1371 dn = NULL; 1372 } 1373 1374 if (fill_inode(in, &rinfo->dir_in[i], NULL, session, 1375 req->r_request_started, -1, 1376 &req->r_caps_reservation) < 0) { 1377 pr_err("fill_inode badness on %p\n", in); 1378 goto next_item; 1379 } 1380 if (dn) 1381 update_dentry_lease(dn, rinfo->dir_dlease[i], 1382 req->r_session, 1383 req->r_request_started); 1384 next_item: 1385 if (dn) 1386 dput(dn); 1387 } 1388 req->r_did_prepopulate = true; 1389 1390 out: 1391 if (snapdir) { 1392 iput(snapdir); 1393 dput(parent); 1394 } 1395 dout("readdir_prepopulate done\n"); 1396 return err; 1397 } 1398 1399 int ceph_inode_set_size(struct inode *inode, loff_t size) 1400 { 1401 struct ceph_inode_info *ci = ceph_inode(inode); 1402 int ret = 0; 1403 1404 spin_lock(&ci->i_ceph_lock); 1405 dout("set_size %p %llu -> %llu\n", inode, inode->i_size, size); 1406 inode->i_size = size; 1407 inode->i_blocks = (size + (1 << 9) - 1) >> 9; 1408 1409 /* tell the MDS if we are approaching max_size */ 1410 if ((size << 1) >= ci->i_max_size && 1411 (ci->i_reported_size << 1) < ci->i_max_size) 1412 ret = 1; 1413 1414 spin_unlock(&ci->i_ceph_lock); 1415 return ret; 1416 } 1417 1418 /* 1419 * Write back inode data in a worker thread. (This can't be done 1420 * in the message handler context.) 1421 */ 1422 void ceph_queue_writeback(struct inode *inode) 1423 { 1424 ihold(inode); 1425 if (queue_work(ceph_inode_to_client(inode)->wb_wq, 1426 &ceph_inode(inode)->i_wb_work)) { 1427 dout("ceph_queue_writeback %p\n", inode); 1428 } else { 1429 dout("ceph_queue_writeback %p failed\n", inode); 1430 iput(inode); 1431 } 1432 } 1433 1434 static void ceph_writeback_work(struct work_struct *work) 1435 { 1436 struct ceph_inode_info *ci = container_of(work, struct ceph_inode_info, 1437 i_wb_work); 1438 struct inode *inode = &ci->vfs_inode; 1439 1440 dout("writeback %p\n", inode); 1441 filemap_fdatawrite(&inode->i_data); 1442 iput(inode); 1443 } 1444 1445 /* 1446 * queue an async invalidation 1447 */ 1448 void ceph_queue_invalidate(struct inode *inode) 1449 { 1450 ihold(inode); 1451 if (queue_work(ceph_inode_to_client(inode)->pg_inv_wq, 1452 &ceph_inode(inode)->i_pg_inv_work)) { 1453 dout("ceph_queue_invalidate %p\n", inode); 1454 } else { 1455 dout("ceph_queue_invalidate %p failed\n", inode); 1456 iput(inode); 1457 } 1458 } 1459 1460 /* 1461 * Invalidate inode pages in a worker thread. (This can't be done 1462 * in the message handler context.) 1463 */ 1464 static void ceph_invalidate_work(struct work_struct *work) 1465 { 1466 struct ceph_inode_info *ci = container_of(work, struct ceph_inode_info, 1467 i_pg_inv_work); 1468 struct inode *inode = &ci->vfs_inode; 1469 u32 orig_gen; 1470 int check = 0; 1471 1472 mutex_lock(&ci->i_truncate_mutex); 1473 spin_lock(&ci->i_ceph_lock); 1474 dout("invalidate_pages %p gen %d revoking %d\n", inode, 1475 ci->i_rdcache_gen, ci->i_rdcache_revoking); 1476 if (ci->i_rdcache_revoking != ci->i_rdcache_gen) { 1477 /* nevermind! */ 1478 spin_unlock(&ci->i_ceph_lock); 1479 mutex_unlock(&ci->i_truncate_mutex); 1480 goto out; 1481 } 1482 orig_gen = ci->i_rdcache_gen; 1483 spin_unlock(&ci->i_ceph_lock); 1484 1485 truncate_inode_pages(inode->i_mapping, 0); 1486 1487 spin_lock(&ci->i_ceph_lock); 1488 if (orig_gen == ci->i_rdcache_gen && 1489 orig_gen == ci->i_rdcache_revoking) { 1490 dout("invalidate_pages %p gen %d successful\n", inode, 1491 ci->i_rdcache_gen); 1492 ci->i_rdcache_revoking--; 1493 check = 1; 1494 } else { 1495 dout("invalidate_pages %p gen %d raced, now %d revoking %d\n", 1496 inode, orig_gen, ci->i_rdcache_gen, 1497 ci->i_rdcache_revoking); 1498 } 1499 spin_unlock(&ci->i_ceph_lock); 1500 mutex_unlock(&ci->i_truncate_mutex); 1501 1502 if (check) 1503 ceph_check_caps(ci, 0, NULL); 1504 out: 1505 iput(inode); 1506 } 1507 1508 1509 /* 1510 * called by trunc_wq; 1511 * 1512 * We also truncate in a separate thread as well. 1513 */ 1514 static void ceph_vmtruncate_work(struct work_struct *work) 1515 { 1516 struct ceph_inode_info *ci = container_of(work, struct ceph_inode_info, 1517 i_vmtruncate_work); 1518 struct inode *inode = &ci->vfs_inode; 1519 1520 dout("vmtruncate_work %p\n", inode); 1521 __ceph_do_pending_vmtruncate(inode); 1522 iput(inode); 1523 } 1524 1525 /* 1526 * Queue an async vmtruncate. If we fail to queue work, we will handle 1527 * the truncation the next time we call __ceph_do_pending_vmtruncate. 1528 */ 1529 void ceph_queue_vmtruncate(struct inode *inode) 1530 { 1531 struct ceph_inode_info *ci = ceph_inode(inode); 1532 1533 ihold(inode); 1534 1535 if (queue_work(ceph_sb_to_client(inode->i_sb)->trunc_wq, 1536 &ci->i_vmtruncate_work)) { 1537 dout("ceph_queue_vmtruncate %p\n", inode); 1538 } else { 1539 dout("ceph_queue_vmtruncate %p failed, pending=%d\n", 1540 inode, ci->i_truncate_pending); 1541 iput(inode); 1542 } 1543 } 1544 1545 /* 1546 * Make sure any pending truncation is applied before doing anything 1547 * that may depend on it. 1548 */ 1549 void __ceph_do_pending_vmtruncate(struct inode *inode) 1550 { 1551 struct ceph_inode_info *ci = ceph_inode(inode); 1552 u64 to; 1553 int wrbuffer_refs, finish = 0; 1554 1555 mutex_lock(&ci->i_truncate_mutex); 1556 retry: 1557 spin_lock(&ci->i_ceph_lock); 1558 if (ci->i_truncate_pending == 0) { 1559 dout("__do_pending_vmtruncate %p none pending\n", inode); 1560 spin_unlock(&ci->i_ceph_lock); 1561 mutex_unlock(&ci->i_truncate_mutex); 1562 return; 1563 } 1564 1565 /* 1566 * make sure any dirty snapped pages are flushed before we 1567 * possibly truncate them.. so write AND block! 1568 */ 1569 if (ci->i_wrbuffer_ref_head < ci->i_wrbuffer_ref) { 1570 dout("__do_pending_vmtruncate %p flushing snaps first\n", 1571 inode); 1572 spin_unlock(&ci->i_ceph_lock); 1573 filemap_write_and_wait_range(&inode->i_data, 0, 1574 inode->i_sb->s_maxbytes); 1575 goto retry; 1576 } 1577 1578 /* there should be no reader or writer */ 1579 WARN_ON_ONCE(ci->i_rd_ref || ci->i_wr_ref); 1580 1581 to = ci->i_truncate_size; 1582 wrbuffer_refs = ci->i_wrbuffer_ref; 1583 dout("__do_pending_vmtruncate %p (%d) to %lld\n", inode, 1584 ci->i_truncate_pending, to); 1585 spin_unlock(&ci->i_ceph_lock); 1586 1587 truncate_inode_pages(inode->i_mapping, to); 1588 1589 spin_lock(&ci->i_ceph_lock); 1590 if (to == ci->i_truncate_size) { 1591 ci->i_truncate_pending = 0; 1592 finish = 1; 1593 } 1594 spin_unlock(&ci->i_ceph_lock); 1595 if (!finish) 1596 goto retry; 1597 1598 mutex_unlock(&ci->i_truncate_mutex); 1599 1600 if (wrbuffer_refs == 0) 1601 ceph_check_caps(ci, CHECK_CAPS_AUTHONLY, NULL); 1602 1603 wake_up_all(&ci->i_cap_wq); 1604 } 1605 1606 /* 1607 * symlinks 1608 */ 1609 static void *ceph_sym_follow_link(struct dentry *dentry, struct nameidata *nd) 1610 { 1611 struct ceph_inode_info *ci = ceph_inode(dentry->d_inode); 1612 nd_set_link(nd, ci->i_symlink); 1613 return NULL; 1614 } 1615 1616 static const struct inode_operations ceph_symlink_iops = { 1617 .readlink = generic_readlink, 1618 .follow_link = ceph_sym_follow_link, 1619 .setattr = ceph_setattr, 1620 .getattr = ceph_getattr, 1621 .setxattr = ceph_setxattr, 1622 .getxattr = ceph_getxattr, 1623 .listxattr = ceph_listxattr, 1624 .removexattr = ceph_removexattr, 1625 }; 1626 1627 /* 1628 * setattr 1629 */ 1630 int ceph_setattr(struct dentry *dentry, struct iattr *attr) 1631 { 1632 struct inode *inode = dentry->d_inode; 1633 struct ceph_inode_info *ci = ceph_inode(inode); 1634 struct inode *parent_inode; 1635 const unsigned int ia_valid = attr->ia_valid; 1636 struct ceph_mds_request *req; 1637 struct ceph_mds_client *mdsc = ceph_sb_to_client(dentry->d_sb)->mdsc; 1638 int issued; 1639 int release = 0, dirtied = 0; 1640 int mask = 0; 1641 int err = 0; 1642 int inode_dirty_flags = 0; 1643 1644 if (ceph_snap(inode) != CEPH_NOSNAP) 1645 return -EROFS; 1646 1647 err = inode_change_ok(inode, attr); 1648 if (err != 0) 1649 return err; 1650 1651 req = ceph_mdsc_create_request(mdsc, CEPH_MDS_OP_SETATTR, 1652 USE_AUTH_MDS); 1653 if (IS_ERR(req)) 1654 return PTR_ERR(req); 1655 1656 spin_lock(&ci->i_ceph_lock); 1657 issued = __ceph_caps_issued(ci, NULL); 1658 dout("setattr %p issued %s\n", inode, ceph_cap_string(issued)); 1659 1660 if (ia_valid & ATTR_UID) { 1661 dout("setattr %p uid %d -> %d\n", inode, 1662 from_kuid(&init_user_ns, inode->i_uid), 1663 from_kuid(&init_user_ns, attr->ia_uid)); 1664 if (issued & CEPH_CAP_AUTH_EXCL) { 1665 inode->i_uid = attr->ia_uid; 1666 dirtied |= CEPH_CAP_AUTH_EXCL; 1667 } else if ((issued & CEPH_CAP_AUTH_SHARED) == 0 || 1668 !uid_eq(attr->ia_uid, inode->i_uid)) { 1669 req->r_args.setattr.uid = cpu_to_le32( 1670 from_kuid(&init_user_ns, attr->ia_uid)); 1671 mask |= CEPH_SETATTR_UID; 1672 release |= CEPH_CAP_AUTH_SHARED; 1673 } 1674 } 1675 if (ia_valid & ATTR_GID) { 1676 dout("setattr %p gid %d -> %d\n", inode, 1677 from_kgid(&init_user_ns, inode->i_gid), 1678 from_kgid(&init_user_ns, attr->ia_gid)); 1679 if (issued & CEPH_CAP_AUTH_EXCL) { 1680 inode->i_gid = attr->ia_gid; 1681 dirtied |= CEPH_CAP_AUTH_EXCL; 1682 } else if ((issued & CEPH_CAP_AUTH_SHARED) == 0 || 1683 !gid_eq(attr->ia_gid, inode->i_gid)) { 1684 req->r_args.setattr.gid = cpu_to_le32( 1685 from_kgid(&init_user_ns, attr->ia_gid)); 1686 mask |= CEPH_SETATTR_GID; 1687 release |= CEPH_CAP_AUTH_SHARED; 1688 } 1689 } 1690 if (ia_valid & ATTR_MODE) { 1691 dout("setattr %p mode 0%o -> 0%o\n", inode, inode->i_mode, 1692 attr->ia_mode); 1693 if (issued & CEPH_CAP_AUTH_EXCL) { 1694 inode->i_mode = attr->ia_mode; 1695 dirtied |= CEPH_CAP_AUTH_EXCL; 1696 } else if ((issued & CEPH_CAP_AUTH_SHARED) == 0 || 1697 attr->ia_mode != inode->i_mode) { 1698 req->r_args.setattr.mode = cpu_to_le32(attr->ia_mode); 1699 mask |= CEPH_SETATTR_MODE; 1700 release |= CEPH_CAP_AUTH_SHARED; 1701 } 1702 } 1703 1704 if (ia_valid & ATTR_ATIME) { 1705 dout("setattr %p atime %ld.%ld -> %ld.%ld\n", inode, 1706 inode->i_atime.tv_sec, inode->i_atime.tv_nsec, 1707 attr->ia_atime.tv_sec, attr->ia_atime.tv_nsec); 1708 if (issued & CEPH_CAP_FILE_EXCL) { 1709 ci->i_time_warp_seq++; 1710 inode->i_atime = attr->ia_atime; 1711 dirtied |= CEPH_CAP_FILE_EXCL; 1712 } else if ((issued & CEPH_CAP_FILE_WR) && 1713 timespec_compare(&inode->i_atime, 1714 &attr->ia_atime) < 0) { 1715 inode->i_atime = attr->ia_atime; 1716 dirtied |= CEPH_CAP_FILE_WR; 1717 } else if ((issued & CEPH_CAP_FILE_SHARED) == 0 || 1718 !timespec_equal(&inode->i_atime, &attr->ia_atime)) { 1719 ceph_encode_timespec(&req->r_args.setattr.atime, 1720 &attr->ia_atime); 1721 mask |= CEPH_SETATTR_ATIME; 1722 release |= CEPH_CAP_FILE_CACHE | CEPH_CAP_FILE_RD | 1723 CEPH_CAP_FILE_WR; 1724 } 1725 } 1726 if (ia_valid & ATTR_MTIME) { 1727 dout("setattr %p mtime %ld.%ld -> %ld.%ld\n", inode, 1728 inode->i_mtime.tv_sec, inode->i_mtime.tv_nsec, 1729 attr->ia_mtime.tv_sec, attr->ia_mtime.tv_nsec); 1730 if (issued & CEPH_CAP_FILE_EXCL) { 1731 ci->i_time_warp_seq++; 1732 inode->i_mtime = attr->ia_mtime; 1733 dirtied |= CEPH_CAP_FILE_EXCL; 1734 } else if ((issued & CEPH_CAP_FILE_WR) && 1735 timespec_compare(&inode->i_mtime, 1736 &attr->ia_mtime) < 0) { 1737 inode->i_mtime = attr->ia_mtime; 1738 dirtied |= CEPH_CAP_FILE_WR; 1739 } else if ((issued & CEPH_CAP_FILE_SHARED) == 0 || 1740 !timespec_equal(&inode->i_mtime, &attr->ia_mtime)) { 1741 ceph_encode_timespec(&req->r_args.setattr.mtime, 1742 &attr->ia_mtime); 1743 mask |= CEPH_SETATTR_MTIME; 1744 release |= CEPH_CAP_FILE_SHARED | CEPH_CAP_FILE_RD | 1745 CEPH_CAP_FILE_WR; 1746 } 1747 } 1748 if (ia_valid & ATTR_SIZE) { 1749 dout("setattr %p size %lld -> %lld\n", inode, 1750 inode->i_size, attr->ia_size); 1751 if (attr->ia_size > inode->i_sb->s_maxbytes) { 1752 err = -EINVAL; 1753 goto out; 1754 } 1755 if ((issued & CEPH_CAP_FILE_EXCL) && 1756 attr->ia_size > inode->i_size) { 1757 inode->i_size = attr->ia_size; 1758 inode->i_blocks = 1759 (attr->ia_size + (1 << 9) - 1) >> 9; 1760 inode->i_ctime = attr->ia_ctime; 1761 ci->i_reported_size = attr->ia_size; 1762 dirtied |= CEPH_CAP_FILE_EXCL; 1763 } else if ((issued & CEPH_CAP_FILE_SHARED) == 0 || 1764 attr->ia_size != inode->i_size) { 1765 req->r_args.setattr.size = cpu_to_le64(attr->ia_size); 1766 req->r_args.setattr.old_size = 1767 cpu_to_le64(inode->i_size); 1768 mask |= CEPH_SETATTR_SIZE; 1769 release |= CEPH_CAP_FILE_SHARED | CEPH_CAP_FILE_RD | 1770 CEPH_CAP_FILE_WR; 1771 } 1772 } 1773 1774 /* these do nothing */ 1775 if (ia_valid & ATTR_CTIME) { 1776 bool only = (ia_valid & (ATTR_SIZE|ATTR_MTIME|ATTR_ATIME| 1777 ATTR_MODE|ATTR_UID|ATTR_GID)) == 0; 1778 dout("setattr %p ctime %ld.%ld -> %ld.%ld (%s)\n", inode, 1779 inode->i_ctime.tv_sec, inode->i_ctime.tv_nsec, 1780 attr->ia_ctime.tv_sec, attr->ia_ctime.tv_nsec, 1781 only ? "ctime only" : "ignored"); 1782 inode->i_ctime = attr->ia_ctime; 1783 if (only) { 1784 /* 1785 * if kernel wants to dirty ctime but nothing else, 1786 * we need to choose a cap to dirty under, or do 1787 * a almost-no-op setattr 1788 */ 1789 if (issued & CEPH_CAP_AUTH_EXCL) 1790 dirtied |= CEPH_CAP_AUTH_EXCL; 1791 else if (issued & CEPH_CAP_FILE_EXCL) 1792 dirtied |= CEPH_CAP_FILE_EXCL; 1793 else if (issued & CEPH_CAP_XATTR_EXCL) 1794 dirtied |= CEPH_CAP_XATTR_EXCL; 1795 else 1796 mask |= CEPH_SETATTR_CTIME; 1797 } 1798 } 1799 if (ia_valid & ATTR_FILE) 1800 dout("setattr %p ATTR_FILE ... hrm!\n", inode); 1801 1802 if (dirtied) { 1803 inode_dirty_flags = __ceph_mark_dirty_caps(ci, dirtied); 1804 inode->i_ctime = CURRENT_TIME; 1805 } 1806 1807 release &= issued; 1808 spin_unlock(&ci->i_ceph_lock); 1809 1810 if (inode_dirty_flags) 1811 __mark_inode_dirty(inode, inode_dirty_flags); 1812 1813 if (mask) { 1814 req->r_inode = inode; 1815 ihold(inode); 1816 req->r_inode_drop = release; 1817 req->r_args.setattr.mask = cpu_to_le32(mask); 1818 req->r_num_caps = 1; 1819 parent_inode = ceph_get_dentry_parent_inode(dentry); 1820 err = ceph_mdsc_do_request(mdsc, parent_inode, req); 1821 iput(parent_inode); 1822 } 1823 dout("setattr %p result=%d (%s locally, %d remote)\n", inode, err, 1824 ceph_cap_string(dirtied), mask); 1825 1826 ceph_mdsc_put_request(req); 1827 if (mask & CEPH_SETATTR_SIZE) 1828 __ceph_do_pending_vmtruncate(inode); 1829 return err; 1830 out: 1831 spin_unlock(&ci->i_ceph_lock); 1832 ceph_mdsc_put_request(req); 1833 return err; 1834 } 1835 1836 /* 1837 * Verify that we have a lease on the given mask. If not, 1838 * do a getattr against an mds. 1839 */ 1840 int ceph_do_getattr(struct inode *inode, int mask) 1841 { 1842 struct ceph_fs_client *fsc = ceph_sb_to_client(inode->i_sb); 1843 struct ceph_mds_client *mdsc = fsc->mdsc; 1844 struct ceph_mds_request *req; 1845 int err; 1846 1847 if (ceph_snap(inode) == CEPH_SNAPDIR) { 1848 dout("do_getattr inode %p SNAPDIR\n", inode); 1849 return 0; 1850 } 1851 1852 dout("do_getattr inode %p mask %s mode 0%o\n", inode, ceph_cap_string(mask), inode->i_mode); 1853 if (ceph_caps_issued_mask(ceph_inode(inode), mask, 1)) 1854 return 0; 1855 1856 req = ceph_mdsc_create_request(mdsc, CEPH_MDS_OP_GETATTR, USE_ANY_MDS); 1857 if (IS_ERR(req)) 1858 return PTR_ERR(req); 1859 req->r_inode = inode; 1860 ihold(inode); 1861 req->r_num_caps = 1; 1862 req->r_args.getattr.mask = cpu_to_le32(mask); 1863 err = ceph_mdsc_do_request(mdsc, NULL, req); 1864 ceph_mdsc_put_request(req); 1865 dout("do_getattr result=%d\n", err); 1866 return err; 1867 } 1868 1869 1870 /* 1871 * Check inode permissions. We verify we have a valid value for 1872 * the AUTH cap, then call the generic handler. 1873 */ 1874 int ceph_permission(struct inode *inode, int mask) 1875 { 1876 int err; 1877 1878 if (mask & MAY_NOT_BLOCK) 1879 return -ECHILD; 1880 1881 err = ceph_do_getattr(inode, CEPH_CAP_AUTH_SHARED); 1882 1883 if (!err) 1884 err = generic_permission(inode, mask); 1885 return err; 1886 } 1887 1888 /* 1889 * Get all attributes. Hopefully somedata we'll have a statlite() 1890 * and can limit the fields we require to be accurate. 1891 */ 1892 int ceph_getattr(struct vfsmount *mnt, struct dentry *dentry, 1893 struct kstat *stat) 1894 { 1895 struct inode *inode = dentry->d_inode; 1896 struct ceph_inode_info *ci = ceph_inode(inode); 1897 int err; 1898 1899 err = ceph_do_getattr(inode, CEPH_STAT_CAP_INODE_ALL); 1900 if (!err) { 1901 generic_fillattr(inode, stat); 1902 stat->ino = ceph_translate_ino(inode->i_sb, inode->i_ino); 1903 if (ceph_snap(inode) != CEPH_NOSNAP) 1904 stat->dev = ceph_snap(inode); 1905 else 1906 stat->dev = 0; 1907 if (S_ISDIR(inode->i_mode)) { 1908 if (ceph_test_mount_opt(ceph_sb_to_client(inode->i_sb), 1909 RBYTES)) 1910 stat->size = ci->i_rbytes; 1911 else 1912 stat->size = ci->i_files + ci->i_subdirs; 1913 stat->blocks = 0; 1914 stat->blksize = 65536; 1915 } 1916 } 1917 return err; 1918 } 1919